System Development & Application
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App. Res. of Comp. Printed Article
Vol. 41, 2024 No. 5
1489-1495

CTU level zero-delay rate control algorithm based on temporal dependency

Cheng Baoping1,2
Tao Xiaoming1
Huang Minfeng2
Xie Xiaoyan2
Du Jin3
Yang Xu4
1. Dept. of Electronic Engineering, Tsinghua University, Beijing 100084, China
2. China Mobile(Hangzhou)Information Technology Co. , Ltd. , Hangzhou 311100, China
3. School of Information & Communication Engineering, University of Electronic Science & Technology of China, Chengdu 611731, China
4. School of Physics & Engineering Technology, Chengdu Normal University, Chengdu 611130, China
DOI: 10.19734/j.issn.1001-3695.2023.09.0428

Abstract

The x265 encoder, based on the efficient video coding standard, allocates bits according to the complexity of the image. Complex images often include high-frequency information with significant motion changes, characterized by weak temporal correlation and high bit consumption. This results in a reduction of bits assigned to images with smooth motion changes, consequently affecting encoding quality and causing significant bitrate fluctuations. Additionally, the x265 encoder employs independent rate-distortion optimization techniques for encoding, neglecting the temporal correlation between encoding units and consequently leading to a loss in encoding performance. To address these issues, this paper proposed a temporal-dependent coding tree unit-level rate control algorithm. Firstly, it explored the most suitable quantization parameters for frame-level bit allocation based on an iterative strategy. Secondly, it established a distortion temporal back-propagation model and calculated distortion impact factors. Lastly, it used these distortion impact factors to adjust the Lagrange multipliers and quantization parameters of coding units. Experimental results demonstrate that compared to the rate control algorithm of x265-3.6, the proposed algorithm achieves an average BD-rate savings of 5.6%.

Foundation Support

国家自然科学基金资助项目(62020106011,U19A2052,62171257,U22B2001)

Publish Information

DOI: 10.19734/j.issn.1001-3695.2023.09.0428
Publish at: Application Research of Computers Printed Article, Vol. 41, 2024 No. 5
Section: System Development & Application
Pages: 1489-1495
Serial Number: 1001-3695(2024)05-029-1489-07

Publish History

[2023-12-08] Accepted Paper
[2024-05-05] Printed Article

Cite This Article

程宝平, 陶晓明, 黄敏峰, 等. 基于时域依赖的编码树单元级零延时码率控制算法 [J]. 计算机应用研究, 2024, 41 (5): 1489-1495. (Cheng Baoping, Tao Xiaoming, Huang Minfeng, et al. CTU level zero-delay rate control algorithm based on temporal dependency [J]. Application Research of Computers, 2024, 41 (5): 1489-1495. )

About the Journal

  • Application Research of Computers Monthly Journal
  • Journal ID ISSN 1001-3695
    CN  51-1196/TP

Application Research of Computers, founded in 1984, is an academic journal of computing technology sponsored by Sichuan Institute of Computer Sciences under the Science and Technology Department of Sichuan Province.

Aiming at the urgently needed cutting-edge technology in this discipline, Application Research of Computers reflects the mainstream technology, hot technology and the latest development trend of computer application research at home and abroad in a timely manner. The main contents of the journal include high-level academic papers in this discipline, the latest scientific research results and major application results. The contents of the columns involve new theories of computer discipline, basic computer theory, algorithm theory research, algorithm design and analysis, blockchain technology, system software and software engineering technology, pattern recognition and artificial intelligence, architecture, advanced computing, parallel processing, database technology, computer network and communication technology, information security technology, computer image graphics and its latest hot application technology.

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